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Method for preparing Fe/Al micro-nano composite powder

A composite powder, micro-nano technology, applied in liquid chemical plating, coating, metal material coating technology and other directions, can solve the problems of instability, plating solution decomposition, increase the difficulty of the preparation process, etc., and achieve increased weight gain rate. , The effect of uniform coating and low cost

Inactive Publication Date: 2013-10-30
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Al is an amphoteric metal, which is unstable in acidic or alkaline baths, and is easy to cause the decomposition of the bath, which greatly increases the difficulty of the preparation process.

Method used

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  • Method for preparing Fe/Al micro-nano composite powder
  • Method for preparing Fe/Al micro-nano composite powder
  • Method for preparing Fe/Al micro-nano composite powder

Examples

Experimental program
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Effect test

Embodiment 1

[0022] The present invention uses kerosene as a reagent, and at temperatures of 180, 240, and 300° C., utilizes carbonyl iron to decompose to generate iron particles to coat micron aluminum. In the experiment, we have done several experiments with different Fe / Al molar ratios; the following details Taking the cladding with Fe / Al molar ratio of 0.5:1 at a temperature of 180°C as an example, the process and cladding effect will be described in detail.

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Abstract

The invention discloses a method for preparing Fe / Al micro-nano composite powder. The method comprises the following steps of: scattering Al powder in kerosene by using ultrasonic oscillation; stirring to form a uniform mixed solution; injecting Fe(CO)5 at 180-300 DEG C and evenly mixing Al powder and Fe(CO)5 in the kerosene; heating to basically finish a coating reaction, wherein the temperature is always kept at 180-300 DEG C in the whole process; centrifugally pumping out reaction products; repeatedly washing the products with absolute ethyl alcohol; and after the product is cleaned, drying in vacuum to obtain Fe / Al composite powder. The method has simple technology and low cost; the synthesized Fe / Al micro-nano composite powder is a nuclear shell structure comprising micro-nano Al coated with nano-Fe, and has good dispersity and excellent thermal property; moreover, the Fe / Al micro-nano composite powder has an obviously higher activity in reaction with O2 in comparison with the raw material Al powder; and the heat output is remarkably increased, the heat release is quicker and more intensive, and the burning process is greatly improved.

Description

technical field [0001] The invention relates to a manufacturing method of a micro-nano composite material. The Fe / Al composite powder prepared by the method is a core-shell structure composed of nano-Fe coated micro-Al, and has a high thermal effect. Background technique [0002] As a good combustible agent, Al powder has high combustion heat and volumetric calorific value, and is widely used in the manufacture of various energetic materials, such as solid rocket propellants, high-energy explosives, pyrotechnics, and pyrotechnic agents. However, due to the problems of slow combustion power, long ignition delay, and insufficient combustion, the potential high calorific value of micron aluminum powder cannot be fully utilized; on the other hand, aluminum has a strong affinity for oxygen, especially for micron-sized active metals For Al, its specific surface area is very large, and the exposed surface atoms are easily oxidized by combining with oxygen, forming a dense oxide fil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02C23C18/08
Inventor 胡木林杜蓉谢长生
Owner HUAZHONG UNIV OF SCI & TECH
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